Opdate validateing code and signing, to reflext the UI vs raw filename for signing

Need more work..

Author: michaelmsonne

src/SignToolGUI/Class/SigningReportExporter.cs

@@ -6,6 +6,24 @@ namespace SignToolGUI.Class
 {
     public static class SigningReportExporter
     {
+        public static bool VerifySignature(string signToolExe, string filePath)
+        {
+            var psi = new System.Diagnostics.ProcessStartInfo
+            {
+                FileName = signToolExe,
+                Arguments = $"verify /pa \"{filePath}\"",
+                RedirectStandardOutput = true,
+                UseShellExecute = false,
+                CreateNoWindow = true
+            };
+            using (var process = System.Diagnostics.Process.Start(psi))
+            {
+                string output = process.StandardOutput.ReadToEnd();
+                process.WaitForExit();
+                return output.IndexOf("Successfully verified", StringComparison.OrdinalIgnoreCase) >= 0;
+            }
+        }
+
         public static void ExportToHtml(
             IList<Forms.MainForm.SigningReportEntry> entries,
             string certType,